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The Saga Of The Uphill-Downhill Shot, Part I
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<blockquote data-quote="Big John 50" data-source="post: 646785" data-attributes="member: 47165"><p>As Farmer Rob says, the 20mm length projectile on a 45 degree angle casts a projection of 15mm length (simple HS geometry points toward that figure, actually it would be 20mm/sq root of 2 = ~14.2mm). Calculating a projection doesn't address my question though.</p><p> </p><p>Since we are on the topic of HS geometry let's briefly consider: Assuming a 30 degree elevation slope suggests using a 30-60-90 triangle--height above/below the shooter is the short leg, the second leg is sq root of 3 x first in length, the hypotenuse (actual sight line) is 2 x the first leg. Therefore, the doping adjustment for a 400 yd sightline can be calculated as 200 x 1.73 = 346 yd. Gee!! Ain't that whut the TBR sed?</p><p> </p><p>Obviously, the TBR uses HS trigonometry and geometry for its doping suggestions. Now that I've layed out my background thinking we'll get back to my respctful question: When the incorrect method (as employed inside the TBR) puts bullets 6" too high why then would anyone use a "correct" method of doping that puts bullets even higher above target?</p><p> </p><p>Some dogs learn that chasing its tail is fruitless, others do it for fun occassionally, others do because they don't know better. Which kind of shooter do you want to be?</p></blockquote><p></p>
[QUOTE="Big John 50, post: 646785, member: 47165"] As Farmer Rob says, the 20mm length projectile on a 45 degree angle casts a projection of 15mm length (simple HS geometry points toward that figure, actually it would be 20mm/sq root of 2 = ~14.2mm). Calculating a projection doesn't address my question though. Since we are on the topic of HS geometry let's briefly consider: Assuming a 30 degree elevation slope suggests using a 30-60-90 triangle--height above/below the shooter is the short leg, the second leg is sq root of 3 x first in length, the hypotenuse (actual sight line) is 2 x the first leg. Therefore, the doping adjustment for a 400 yd sightline can be calculated as 200 x 1.73 = 346 yd. Gee!! Ain't that whut the TBR sed? Obviously, the TBR uses HS trigonometry and geometry for its doping suggestions. Now that I've layed out my background thinking we'll get back to my respctful question: When the incorrect method (as employed inside the TBR) puts bullets 6" too high why then would anyone use a "correct" method of doping that puts bullets even higher above target? Some dogs learn that chasing its tail is fruitless, others do it for fun occassionally, others do because they don't know better. Which kind of shooter do you want to be? [/QUOTE]
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The Saga Of The Uphill-Downhill Shot, Part I
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